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Thread: White cloudy water post yellow algae, flocking and in the presence of high Ca+

  1. Back To Top    #1

    Join Date
    Sep 2015

    White cloudy water post yellow algae, flocking and in the presence of high Ca+

    My pool recently had an invasion of Yellow algae. Killed this off with a copper based algae killer and a flocking agent.

    In order for the flocking agent to work properly I was told to raise my pH to high normal to just above high normal. I applied the flocking agent and waited. 2 days later, the water was still milky white. I took in a water sample. ph was mid normal but the Alkalinity was 40. So they told me to raise my alkalinity using baking soda. (this is what I usually use so I didn't question it. ) Using the Px'd 30 lb's of baking soda on retest my alkalinity was 160. Ph almost 8. The water remains milky/ cloudy. I have vacuumed to waste 2x now, and run the filter for 24 hrs after this. The water is unchanging.

    Please let me note that at the start of the season the water was a little cloudy post shocking and flocking to kill and clear the algae. Dropping the pH cleared this as I discovered that Calcium makes the water cloudy when the pH is high. My Ca by the way is about 550. And I can't find anyone in the area who sells the ONLY chemical which removes Ca from the water, Cal treat.

    I am draining and having the pool resurfaced this fall but in the meantime I would love the water to be clear again.

    33,000 gal. in-ground concrete/ white plaster, Chlorine and sand filtration.

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: White cloudy water post yellow algae, flocking and in the presence of high Ca+

    Hello and welcome! Well, you've taken the long road to find us, but it's good you did. Next year, I would suggest staying away from the pool store for any magic potions, floc, or anything else they try to sell you based on their testing. You're just funding their electric bill. First priority before next season - get yourself the right test kit (TF-100 or Taylor K-2006) link below. It ALL starts there. You must have your OWN accurate test results. Also, start reading the TFP Pool School page (link below) for all the basic info you need to know about water chemistry. This will get you prepared well in advance. We keep it very easy here at TFP as long as you stay with the basic items noted below and stay way from the pool store ... unless you want a new toy from the pool. Welcome!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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